Topic: Mathematics
If $\alpha$ and $\beta$ are the roots of the equation $x^{2}-px+q=0$, then $\Sigma\alpha^{2}$ is
- A. $p^{2}+2q$
- B. $p+2q$
- C. $p^{2}-2q$
- D. $p-2q$
Answer: C. $p^{2}-2q$
Explanation: $x^{2}-px+q=0$. $\alpha^{2}+\beta^{2}=(\alpha+\beta)^{2}-2\alpha\beta = p^{2}-2q$.